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Effect of intracochlear aminooxyacetic acid on cochlear potentials and endolymph composition
The Annals of Otology, Rhinology, and Laryngology
|March 1, 1975
Summary
Aminooxyacetic acid (AOAA) reduced guinea pig hearing potentials, impacting cochlear microphonics and nerve action potentials. Ionic changes in the cochlea were not the cause, and pyridoxine could not reverse AOAA
Area of Science:
- Oto-neurology
- Pharmacology
- Auditory Neuroscience
Background:
- The endocochlear potential (EP) is crucial for hearing.
- Understanding factors affecting EP is vital for auditory research.
- Aminooxyacetic acid (AOAA) is a potential modulator of neural and sensory functions.
Purpose of the Study:
- To investigate the effects of Aminooxyacetic acid (AOAA) on auditory potentials in guinea pigs.
- To determine the mechanism behind AOAA's impact on the cochlear system.
- To assess the potential for pyridoxine to counteract AOAA's effects.
Main Methods:
- Perfusion of Aminooxyacetic acid (AOAA) through the scala tympani in guinea pigs.
- Measurement of endocochlear potential (EP), cochlear microphonics (CM), and compound action potential (CAP).
- Analysis of ionic content (Na+, K+) in scala media and direct current potential in the organ of Corti.
Main Results:
- AOAA induced a biphasic reduction in the endocochlear potential.
- Shifts in input-output functions of cochlear microphonics and compound action potential were observed.
- No significant alterations in Na+ and K+ content of scala media were detected; direct current potential in the organ of Corti remained unaffected.
- Pyridoxine failed to antagonize the effects of AOAA.
Conclusions:
- Aminooxyacetic acid (AOAA) significantly disrupts auditory potentials in the guinea pig cochlea.
- The mechanism of AOAA's action does not involve direct alterations of Na+ and K+ homeostasis in the scala media.
- AOAA's effects on hearing are not readily reversible with pyridoxine, suggesting complex interactions within the auditory system.